Combination search
Looking for commercially available native plant species suitable to your state or region, try the Recommended Species page.
| scientific name | common name(s) | image gallery |
| Oenothera pubescens | Pubescent Evening Primrose Silky Evening Primrose South American Evening Primrose South American Evening-primrose | |
| Oenothera rhombipetala | Fourpoint Evening-primrose Four-point Evening Primrose Diamond Petal Primrose Greater Four-point Evening-primrose | |
| Oenothera rosea | Rose Evening Primrose | |
| Oenothera speciosa | Pink Evening Primrose Showy Evening Primrose Mexican Evening Primrose Showy Primrose Pink Ladies Buttercups Pink Buttercups | |
| Oenothera suffrutescens | Scarlet Beeblossom Scarlet Gaura | |
| Oenothera suffulta | Kisses Wild Honeysuckle Beeblossom Roadside Gaura | |
| Oenothera suffulta ssp. nealleyi | Nealley's Kisses | |
| Oenothera triloba | Stemless Evening-primrose Stemless Evening Primrose | |
| Oenothera villosa | Hairy Evening Primrose | |
| Oenothera villosa ssp. strigosa | Hairy Evening-primrose Common Evening-primrose Common Evening Primrose | |
| Oligomeris linifolia | Lineleaf Whitepuff | |
| Oligoneuron rigidum | Stiff Goldenrod Hard-leaf Goldenrod | |
| Oligoneuron rigidum var. humile | Stiff Goldenrod | |
| Onosmodium bejariense | Soft-hair Marbleseed | |
| Onosmodium bejariense var. occidentale | Western Marbleseed | |
| Opuntia chlorotica | Dollarjoint Pricklypear Clock-face Prickly-pear Pancake Pear Silver-dollar Cactus | |
| Opuntia chihuahuensis | Chihuahua Prickly Pear Chihuahua Pricklypear | |
| Opuntia cymochila | Grassland Pricklypear | |
| Opuntia ellisiana | Spineless Prickly Pear Tigertongue South Texas Pricklypear | |
| Ophioglossum engelmannii | Limestone Adder's-tongue Limestone Adderstongue | |
| Opuntia engelmannii | Cactus Apple Prickly Pear | |
| Opuntia engelmannii var. cuija | Cactus Apple | |
| Opuntia engelmannii var. engelmannii | Cactus Apple Prickly Pear | |
| Opuntia engelmannii var. lindheimeri | Texas Prickly Pear Lindheimer's Prickly Pear Lindheimer Prickly Pear | |
| Opuntia fragilis | Brittle Prickly Pear Fragile Prickly Pear Pygmy Prickly Pear Brittle Cactus | |
| Opuntia humifusa | Low Prickly Pear Smooth Prickly Pear Devil's Tongue | |
| Opuntia macrorhiza | Bigroot Prickly Pear Twist-spine Prickly Pear Common Prickly Pear Plains Prickly Pear | |
| Opuntia macrocentra | Purple Pricklypear Purple Prickly Pear Long-spined Prickly Pear Black Spine Prickly Pear | |
| Opuntia macrocentra var. macrocentra | Purple Pricklypear Purple Prickly Pear | |
| Opuntia macrorhiza var. macrorhiza | Twistspine Pricklypear Plains Prickly Pear | |
| Opuntia macrorhiza var. pottsii | Twistspine Pricklypear Plains Prickly Pear | |
| Opuntia phaeacantha | Tulip Prickly Pear Brownspine Prickly Pear Cactus Purple-fruited Prickly Pear Brown-spined Prickly Pear New Mexico Prickly Pear Desert Prickly Pear | |
| Opuntia polyacantha | Plains Prickly Pear Hair-spine Prickly Pear Nopal Peludito | |
| Opuntia polyacantha var. arenaria | El Paso Pricklypear Sand Pricklypear Sand Prickly Pear | |
| Opuntia polyacantha var. erinacea | Grizzlybear Pricklypear Oldman Cactus Grizzly Prickly Pear Hedgehog Prickly Pear Mohave Prickly Pear Grizzly Bear Pricklypear | |
| Opuntia polyacantha var. hystricina | Grizzlybear Pricklypear Porcupine Prickly Pear Porcupine Pricklypear | |
| Opuntia polyacantha var. polyacantha | Hairspine Pricklypear Utah Grizzlybear Pricklypear | |
| Opuntia santa-rita | Santa Rita Prickly Pear Purple Prickly Pear | |
| Opuntia valida | San Antonio Pricklypear San Antonio Prickly Pear | |
| Opuntia Śwootonii | Wooton's Prickly Pear Wooton's Pricklypear | |
| Oreoxis alpina | Alpine Oreoxis | |
| Oreoxis alpina ssp. alpina | Alpine Oreoxis Tundra Alpine-parsley Tundra Alpine Parsley | |
| Oryzopsis asperifolia | Roughleaf Ricegrass | |
| Oreoxis bakeri | Baker's Alpineparsley Baker's Alpine-parsley Baker's Alpine Parsley | |
| Orobanche cooperi | Desert Broomrape Spike Broomrape | |
| Orobanche corymbosa | Flat-top Broomrape Flattop Broomrape | |
| Orobanche corymbosa ssp. corymbosa | Flat-top Broomrape Flattop Broomrape | |
| Orobanche fasciculata | Clustered Broomrape Yellow Broomrape | |
| Oreoxis humilis | Rocky Mountain Alpineparsley Rocky Mountain Alpine-parsley Pikes Peak Spring-parsley Pikes Peak Spring Parsley | |
| Orobanche ludoviciana | Louisiana Broomrape | |
| Orthocarpus luteus | Yellow Owl's-clover | |
| Orobanche ludoviciana ssp. ludoviciana | Louisiana Broomrape Sand Broomrape Suksdorf's Broomrape | |
| Orobanche ludoviciana ssp. multiflora | Manyflower Broomrape | |
| Orobanche multicaulis | Spiked Broomrape | |
| Oreochrysum parryi | Parry's Goldenrod | |
| Orthocarpus purpureoalbus | Purple-white Owl-clover Purplewhite Owl's Clover Purplewhite Owl's-clover Purplewhite Owlclover | |
| Orobanche riparia | River Broom Rape River Broom-rape River Broomrape | |
| Orthilia secunda | Sidebells Wintergreen One-sided Wintergreen | |
| Orobanche uniflora | One-flowered Broomrape One-flower Cancer Root | |
| Osmorhiza berteroi | Sweetcicely Mountain Sweet-cicely | |
| Osmorhiza depauperata | Bluntseed Sweetroot | |
| Ostrya knowltonii | Ironwood Knowlton's Hop-hornbeam Knowlton's Hophornbeam Western Hop-hornbeam | |
| Osmorhiza longistylis | Longstyle Sweetroot Aniseroot Sweet-cicely Wild Licorice | |
| Oxytenia acerosa | Copperweed | |
| Oxalis albicans | Radishroot Woodsorrel | |
| Oxalis alpina | Alpine Woodsorrel Alpine Wood-sorrel | |
| Oxalis albicans ssp. albicans | Radishroot Woodsorrel Western Yellow Wood-sorrel | |
| Oxalis albicans ssp. pilosa | Hairy Western Wood-sorrel Hairy Wood Sorrel Radishroot Woodsorrel | |
| Oxalis caerulea | Blue Wood-sorrel Blue Woodsorrel | |
| Oxytropis deflexa | Nodding Locoweed | |
| Oxalis decaphylla | Tenleaf Woodsorrel Ten-leaf Wood-sorrel | |
| Oxytropis deflexa var. sericea | Blue Nodding Locoweed | |
| Oxalis dillenii | Slender Yellow Wood Sorrel Yellow Wood Sorrel Yellow Woodsorrel | |
| Oxyria digyna | Alpine Mountainsorrel Mountain Sorrel | |
| Oxalis drummondii | Drummond's Wood-sorrel Large-leaf Wood-sorrel Drummond's Woodsorrel | |
| Oxypolis fendleri | Fendler's Cowbane | |
| Oxalis frutescens | Shrubby Wood-sorrel Shrubby Woodsorrel | |
| Oxalis frutescens ssp. angustifolia | Shrubby Wood-sorrel Shrubby Woodsorrel | |
| Oxytropis lambertii | Purple Locoweed | |
| Oxalis latifolia | Broad-leaf Wood-sorrel Broadleaf Woodsorrel | |
| Oxytropis lambertii var. articulata | Purple Locoweed Locoweed | |
| Oxytropis lambertii var. bigelovii | Purple Locoweed | |
| Oxytropis parryi | Parry's Oxytrope | |
| Oxytropis sericea | White Locoweed Silky Locoweed | |
| Oxytropis sericea var. sericea | White Locoweed | |
| Oxytropis splendens | Showy Locoweed | |
| Oxalis stricta | Common Yellow Oxalis Yellow Wood-sorrel Upright Yellow Wood-sorrel Yellow Woodsorrel | |
| Oxalis violacea | Violet Woodsorrel Violet Wood-sorrel | |
| Parkinsonia aculeata | Retama Paloverde Mexican Paloverde Jerusalem Thorn Horsebean Lluvia De Oro | |
| Panicum alatum | Winged Panic Grass Winged Panicgrass | |
| Parthenium alpinum | Alpine Feverfew | |
| Panicum alatum var. minus | Winged Panic Grass Winged Panicgrass | |
| Panicum amarum | Bitter Panicgrass Beachgrass Coastal Panic Grass | |
| Panicum amarum var. amarum | Bitter Panic Grass Bitter Panicgrass | |
| Panicum bulbosum | Bulb Panic Grass Bulb Panicgrass | |
| Packera cana | Woolly Groundsel Silver-woolly Groundsel Gray Ragwort | |
| Packera cardamine | Bittercress Ragwort Heartleaf Groundsel | |
| Panicum capillare | Witchgrass | |
| Parthenium confertum | Gray's Feverfew | |
| Packera crocata | Saffron Ragwort | |
| scientific name | common name(s) | image gallery |
